Which is the correct description of a hash result as it relates to digital certificates?

Which is the correct description of a hash result as it relates to digital certificates?
A . A unique value used to verify the input data
B . An output value that is used to identify the person or deuce that authored the input data.
C . An obfuscation used to mask the input data.
D . An encrypted output value used to safe-guard die input data

Answer: A